Question

所以我想将一些string值发送到我的节点服务器并在MySQL表中找到该值。

我有一个从服务

获取数据的组件

ngOnInit() {
    this.instructionsService.getAllInstructions().subscribe(instructions => {
      this.instructions = instructions;
    });
}

然后我有一个从node服务器

获取数据的服务

getAllInstructions() {
    return this.http.get('/api/profile/')
      .map(res => res.json());
}

最后我有节点api

app.get('/profile',getAllInstructions);
function getAllInstructions(req,res){
connection.query("select * from users where id='somekindofid'",function(err, rows, fields) {
        res.json(rows);
    }
}

`

我想用我的组件发送的值＆＃39; somekindofid＆＃39; 替换

我该怎么做？

Answer 1

您应该将/profile/:id传递给其URL本身内的node方法。同样，您应该将API路由更改为id，其中app.get('/profile/:id',getAllInstructions); function getAllInstructions(req,res){ connection.query("select * from users where id="+ req.params.id,function(err, rows, fields) { res.json(rows); } }是将从API的使用者传递的参数。

<强>节点

getAllInstructions(id) {
    return this.http.get(`/api/profile/${id}`)
      .map(res => res.json());
}

<强>服务

ngOnInit() {
    let userId = 'pankaj';
    this.instructionsService.getAllInstructions(userId).subscribe(instructions => {
      this.instructions = instructions;
    });
}

<强>组件

library(dplyr) # dplyr 0.5.0
library(lazyeval)

df <- data_frame(group = c(1, 2, 2, 3, 3, 3))

g <- "group"

df %>%
  group_by_(g) %>%
  summarise_(
    n = n(),
    sum = interp(~sum(col, na.rm = TRUE), col = as.name(g))
  )
# Error in n() : This function should not be called directly

从Angular2 Component

1 个答案: